The E4 error code is a result of a malfunctioning defrost sensor. If
the error code is on the right then it is the defrost sensor in the
upper chamber.
Attached is a link to Avanti service and parts. Provide them with
the model number of your wine cellar and they will be able to provide
you with a price and information on the part needed for repair.
http://www.avantiproducts.com/index.php?page=contact
If you have the owner's manual or are able to speak with a service technician through Avanti, then this can be a diy repair.
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